The ethanol extract of the dried root bark of Tripterygium wilfordii Hook. f. afforded one new triterpene: 24, 29-dinor-D:A-friedoolean-4-en-2 beta, 6 alpha, 22 beta -trihydroxy-3, 21-dione, 6 alpha -hydroxy triptocalline 1; one new diterpenoid: 11, 16-dihydroxy-14-methoxy-18 (4 -->3) abeo-abieta-3, 8, 11, 13-tetraene-18-oic acid, 16-hydroxy triptobenzene H 2; and one new diterpenoid alkaloid, triptotin J 3. Their structures were established on the basis of spectroscopic studies.